package servlet;

import model.User;
import model.UserDao;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@WebServlet("/login")
public class LoginServlet extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1. 读取参数中的用户名和密码
        req.setCharacterEncoding("utf8");
        String username = req.getParameter("username");
        String password = req.getParameter("password");

        if(username == null || username.length() == 0 || password == null || password.length() == 0){
            resp.setContentType("text/html; charset=utf8");
            resp.getWriter().write("您输入的用户名或者密码为空");
            return;
        }

        //2. 查询数据库, 用户名密码是否正确
        UserDao userDao = new UserDao();
        User user = userDao.getUserByName(username);
        if(user == null){
            // 用户名不存在!
            resp.setContentType("text/html; charset=utf8");
            resp.getWriter().write("您输入的用户名或密码不正确!");
            return;
        }
        if (!password.equals(user.getPassword())) {
            // 密码不正确!
            resp.setContentType("text/html; charset=utf8");
            resp.getWriter().write("您输入的用户名或密码不正确!");
            return;
        }

        //3. 创建会话
        HttpSession session = req.getSession(true);
        session.setAttribute("user", user);

        //4. 跳转到主页
        resp.sendRedirect("blog_list.html");
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        HttpSession session = req.getSession(false);
        if (session == null)
        {
            resp.setStatus(403);
            return;
        }
        User user = (User) session.getAttribute("user");
        if(user == null){
            resp.setStatus(403);
            return;
        }

        resp.setStatus(200);
    }
}
